CVE-2026-62958

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CVE-2026-62958

Summary: libriscv: Out of bounds read vuln in the ELF parser (Denial of service)

Details: libriscv is a RISC-V sandbox and emulator. Prior to 1.18, a crafted ELF binary can cause out-of-bounds reads in the host emulator. `Memory<W>::binary_loader` checks `PT_LOAD` program-header bounds, but `Memory<W>::serialize_execute_segment` trusts section-header `sh_offset` and `sh_size` when locating `.text` without verifying the file range against `m_binary.size()`; `Memory<W>::lookup()` has a similar section-table problem. Malformed `.text` or `.symtab` offsets can therefore bypass the program-header checks and point outside the binary buffer, crashing rvlinux. With suitable memory layout or integer overflow, out-of-buffer host heap memory may instead be mapped into the guest by `create_execute_segment()`, potentially exposing host memory. The reported reproducer demonstrates a host SIGSEGV, while memory disclosure through grooming is described as possible rather than demonstrated. This issue is fixed in version 1.18.

References: https://github.com/libriscv/libriscv/releases/tag/v1.18, https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/62xxx/CVE-2026-62958.json, https://github.com/libriscv/libriscv/security/advisories/GHSA-gm4g-6c78-gr3w, https://nvd.nist.gov/vuln/detail/CVE-2026-62958, https://github.com/libriscv/libriscv/commit/61ef9ca82c8876dd80b33780893ba512af780e93, https://github.com/libriscv/libriscv/commit/7bd1c189f9f9d54368cde096b07b194ad680f9fa